Coefficient of kinetic friction between sled and trail


A sled is pulled with a horizontal force of 20 N along a level trail, and the acceleration is found to be 0.38 m/s2. An extra mass m = 4.0 kg is placed on the sled. If the same force is just barely able to keep the sled moving, what is the coefficient of kinetic friction between the sled and the trail?

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Physics: Coefficient of kinetic friction between sled and trail
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